9=12+3d

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Solution for 9=12+3d equation: 



9=12+3d

We move all terms to the left:

9-(12+3d)=0

We add all the numbers together, and all the variables

-(3d+12)+9=0

We get rid of parentheses

-3d-12+9=0

We add all the numbers together, and all the variables

-3d-3=0

We move all terms containing d to the left, all other terms to the right

-3d=3

d=3/-3

d=-1

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